Mirimyces Nag Raj, Coelomycetous Anamorphs with Appendage-bearing Conidia: 477 (1993)
Facesoffungi number: FoF 07448
Ascomycota, genera incertae sedis
Saprobic on decaying leaves of Mimusops sp. (Sapotaceae). Sexual morph: undetermined. Asexual morph: Conidiomata brown to dark brown, pycnidial, mostly gregarious, subepidermal in origin, deeply immersed, obpyriform to globose or irregular, unilocular or plurilocular, glabrous, thick-walled, ostiolate. Ostiole single, cylindrical to subcylindrical, centrally located. Conidiomatal wall composed of textura angularis to textura prismatica with thick-walled, dark brown to hyaline cells. Conidiophores reduced to conidiogenous cells. Conidiogenous cells hyaline, ampulliform, doliiform, lageniform, or subcylindrical, with periclinal thickenings at collarette zone. Conidia hyaline, ovoid to ellipsoid or fusiform, occasionally wall bulging in the middle or lower half, unicellular, thin- and smooth-walled, guttulate, bearing deeply infundibuliform, cylindrical or irregular, mucoid apical and basal appendages.
Notes: Mirimyces is a monotypic genus. It can easily be confused with the asexual morph of Phacidium. They share similar form of conidiomata and conidia, but can be distinguished by conidiogenous cells and conidial appendages. Mirimyces has ampulliform, doliiform, lageniform conidiogenous cells, with flared collarettes and conspicuous periclinal thickenings. The asexual morph of Phacidium has cylindrical, subcylindrical conidiogenous cells without flared, thickened collarettes. In addition, conidia of Mirimyces bear apical and basal appendages (arising from structure changes in appendages primordia delimited on the developing conidium), but conidia of the asexual morph of Phacidium have apical appendages (originating by eversion of partial and full mucoid sheath). No sexual morph has been linked to Mirimyces and no molecular data is available in GenBank.
Li WJ, McKenZie EHC, Liu JK, Bhat DJ, Dai DQ, Caporesi E, Tian Q, Maharachcikumbura SSN, Luo ZL, Shang QJ, Zhang JF, Tangthirasunun N, Karunarathna SC, Xu JC, Hyde KD (2020) Taxonomy and phylogeny of hyaline-spored coelomycetes. Fungal Diversity 100: pages279–801.